Electroconductive thick film composition(s), electrode(s), and semiconductor device(s) formed therefrom

a thin film, electrode technology, applied in the direction of non-metal conductors, conductors, metal/alloy conductors, etc., can solve the problems of affecting the conversion efficiency of solar cells, affecting the long-term reliability of semiconductor devices, and generally lowering adhesion strength

Active Publication Date: 2009-02-24
SOLAR PASTE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the Ag compositions cannot produce a back surface field, conversion efficiency of the solar cell suffers.
On the other hand, when Ag / Al compositions are used, adhesion strength is generally lowered and gives rise to concerns regarding long term reliability.
This is due to the fact that the addition of Al will generally hurt solderability and thus, adhesion performance.

Method used

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  • Electroconductive thick film composition(s), electrode(s), and semiconductor device(s) formed therefrom
  • Electroconductive thick film composition(s), electrode(s), and semiconductor device(s) formed therefrom
  • Electroconductive thick film composition(s), electrode(s), and semiconductor device(s) formed therefrom

Examples

Experimental program
Comparison scheme
Effect test

application example 1

[0062]Application Example 1 is detailed below.

[0063]The appropriate amount of organic medium, glass frit, inorganic additives, and Ag / Al are mixed in a vacuum mixer for 15-30 min. The mixture was then sent through a power mixer or roll mill to disperse the ingredients thoroughly. The degree of dispersion is measured by Fineness of Grind (FOG). When dispersion was sufficient, the paste was formulated to the required solids and viscosity level.

Manufacture of Solar Cell

[0064]The present invention can be applied to a broad range of semiconductor devices, although it is especially effective in light-receiving elements such as photodiodes and solar cells. The discussion below describes how a solar cell was formed utilizing the composition(s) of present invention.

[0065]Using the silver / aluminum electroconductive paste obtained, a solar cell was formed in the following sequence.

[0066](1) On the back face of a Si substrate having a silver electrode on the front surface, the newly invented Ag...

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Abstract

The present invention is directed to an electroconductive thick film composition comprising: (a) electroconductive metal particles selected from (1) Al, Cu, Au, Ag, Pd and Pt; (2) alloy of Al, Cu, Au, Ag, Pd and Pt; and (3) mixtures thereof; (3) glass frit wherein said glass frit is Pb-free; dispersed in (d) an organic medium, and wherein the average diameter of said electroconductive metal particles is in the range of 0.5-10.0 μm. The present invention is further directed to an electrode formed from the composition as detailed above and a semiconductor device(s) (for example, a solar cell) comprising said electrode.

Description

FIELD OF THE INVENTION[0001]The present invention is directed primarily to thick film compositions, electrodes, and semiconductor devices. It is further directed to a silicon semiconductor device. In particular, it pertains to an electroconductive composition used in the formation of a thick film electrode of a solar cell. The present invention is further directed to a silver electroconductive thick film composition (paste) for a solar cell.TECHNICAL BACKGROUND OF THE INVENTION[0002]The present invention can be applied to a broad range of semiconductor devices, although it is especially effective in light-receiving elements such as photodiodes and solar cells. The background of the invention is described below with reference to solar cells as a specific example of the prior art.[0003]A conventional solar cell structure with a p-type base has a negative electrode that is typically on the front-side or sun side of the cell and a positive electrode on the back side. It is well known th...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01B1/22H01L23/50
CPCC03C3/064C03C3/066C03C8/04C03C8/18C03C14/006H01B1/22H01L31/022425C03C2214/08C03C2214/16H05K1/092Y02E10/542H01L2924/0002H01L2924/00H01L31/0224H01L31/04
Inventor WANG, YUELIHANG, KENNETH WARREN
Owner SOLAR PASTE LLC
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